【单选题】【消耗次数：1】
由于6°分带投影中距离中央子午线越远，子午线长度变形越大，该问题的解决办法是（ ）。
①
限制测图区域的面积
②
提高测距精度
③
改用3°带分带投影
④
提高控制网起始方位角精度
参考答案：
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纠错
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